<!DOCTYPE html>
<!--16.尚硅谷_css2.1_margin叠加-->
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			*{
				margin: 0;
				padding: 0;
			}
			#up, #down{
				width: 200px;
				height: 200px;
				background: pink;
				margin: 50px;
			}
		</style>
	</head>
	<body>
		<div id="up">up</div>
		<div style="overflow: hidden;">
			<div id="down">down</div>
		</div>

	</body>
</html>
